Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/57493
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dc.contributor.authorSharma, Nishaen
dc.contributor.authorRuhnke, Isabelleen
dc.contributor.authorSwick, Roberten
dc.contributor.authorHunt, Peter Wen
dc.contributor.authorHine, Bradleyen
dc.date.accessioned2024-01-23T04:52:38Z-
dc.date.available2024-01-23T04:52:38Z-
dc.date.created2018-06-
dc.date.issued2018-10-27-
dc.identifier.urihttps://hdl.handle.net/1959.11/57493-
dc.descriptionPlease contact rune@une.edu.au if you require access to this thesis for the purpose of research or study.en
dc.description.abstract<p>Gastrointestinal nematodes such as <i>Ascaridia galli (A. galli)</i> are prevalent in laying hens kept in production systems with free access to outdoor areas. A pilot study was conducted to establish an infection model with <i>A. galli</i> which then was used in two subsequent experiments to evaluate the impacts of different levels of <i>A. galli</i> infection on performance, egg quality and immune status of laying hens. In an artificial infection study, laying hens were inoculated with low (250), medium (1000), and high (2500) levels of embryonated <i>A. galli</i> eggs/hen. In a natural infection study, hens were ranged on the areas contaminated with <i>A. galli</i> during the artificial infection study. In both studies, uninfected hens served as control groups.</p><p> Infecting hens orally with 500 or 1000 embryonated <i>A. galli</i> eggs in multiple applications was found to be a more reliable method compared to infecting hens using a single dose. The artificial infection study showed that <i>A. galli</i> infection with different dose rates had no effect on feed intake, body weight, and FCR until 40 weeks of age. There was no difference in egg production at 25, 35 and 40 weeks of age. Serum and yolk antibodies against <i>A. galli</i> were higher at 20 weeks post infection.</p><p> Naturally infected hens had a higher infection intensity exhibited by higher intestinal worm counts and excreta egg counts compared to the artificially infected hens. However, this higher infection intensity did not negatively affect egg production, egg mass, feed intake, FCR and egg quality during the experiment. The liver lipid content of the hens with higher <i>A. galli</i> burden were compared to the uninfected hens and the results showed that the infected hens had consistently lower liver lipid reserves compared to the uninfected hens.</p><p> Across the two trials the sensitivity of the ELISA assay was 100% and 96% for serum and egg yolk samples respectively, whereas pooled excreta egg counts had sensitivity of 93%. Measurements of serum and yolk antibody levels can be helpful for the detection of current or prior <i>A. galli</i> infection. The practical and non-invasive method of yolk sample analysis is likely to be as informative as using serum samples to detect <i>A. galli</i> infection. Results of these experiments indicate that <i>A. galli</i> causes no production loss during the first three months of the free range laying hen's production cycle. However, production losses that might occur in the later stages of laying cycle still needs to be investigated.</p>en
dc.languageenen
dc.relation.urihttps://hdl.handle.net/1959.11/22953en
dc.titleImpacts of Ascaridia galli Infection on Health, Immunity, Productivity and Egg Quality of Free-Range Laying Hensen
dc.typeThesis Doctoralen
dc.subject.keywordsVeterinary Pharmacologyen
dc.subject.keywordsVeterinary Parasitologyen
dc.subject.keywordsVeterinary Medicineen
local.contributor.firstnameNishaen
local.contributor.firstnameIsabelleen
local.contributor.firstnameRoberten
local.contributor.firstnamePeter Wen
local.contributor.firstnameBradleyen
local.subject.for2008070706 Veterinary Medicineen
local.subject.for2008070710 Veterinary Pharmacologyen
local.subject.for2008070708 Veterinary Parasitologyen
local.subject.seo2008830501 Eggsen
local.subject.seo2008839901 Animal Welfareen
local.subject.seo2008830309 Poultryen
dc.date.conferred2018en
local.hos.emailers-sabl@une.edu.auen
local.thesis.passedPasseden
local.thesis.degreelevelDoctoralen
local.thesis.degreenameDoctor of Philosophy - PhDen
local.contributor.grantordegree grantoren
local.profile.schoolSchool of Environmental and Rural Scienceen
local.profile.schoolSchool of Environmental and Rural Scienceen
local.profile.schoolPoultry Hub Australiaen
local.profile.schoolSchool of Environmental and Rural Scienceen
local.profile.emailnsharma6@myune.edu.auen
local.profile.emailiruhnke@une.edu.auen
local.profile.emailrswick@une.edu.auen
local.profile.emailphunt@une.edu.auen
local.output.categoryT2en
local.record.placeauen
local.record.institutionUniversity of New Englanden
local.identifier.epublicationsrecordune_thesis-20180405-161531en
local.contributor.lastnameSharmaen
local.contributor.lastnameRuhnkeen
local.contributor.lastnameSwicken
local.contributor.lastnameHunten
local.contributor.lastnameHineen
dc.identifier.staffune-id:nsharma5en
dc.identifier.staffune-id:iruhnkeen
dc.identifier.staffune-id:rswicken
dc.identifier.staffune-id:phunten
local.profile.orcid0000-0001-5423-9306en
local.profile.orcid0000-0003-3376-1677en
local.profile.roleauthoren
local.profile.rolesupervisoren
local.profile.rolesupervisoren
local.profile.rolesupervisoren
local.profile.rolesupervisoren
local.identifier.unepublicationidune:_thesis-20180405-161531en
local.identifier.unepublicationidune:_thesis-20180405-161531en
local.RightsStatementCopyright 2018 - Nisha Sharmaen
dc.identifier.academiclevelStudenten
dc.identifier.academiclevelAcademicen
dc.identifier.academiclevelAcademicen
dc.identifier.academiclevelAcademicen
dc.identifier.academiclevelAcademicen
local.thesis.bypublicationYesen
local.title.maintitleImpacts of Ascaridia galli Infection on Health, Immunity, Productivity and Egg Quality of Free-Range Laying Hensen
local.relation.fundingsourcenoteUNE scholarship and CRC scholarshipen
local.output.categorydescriptionT2 Thesis - Doctorate by Researchen
local.relation.doi10.3382/ps/pex347en
local.relation.doi10.1016/j.vetpar.2018.04.009en
local.relation.doi10.3382/ps/pey068en
local.relation.doi10.17582/journal.jap/2017/4.3.41.46en
local.school.graduationSchool of Environmental & Rural Scienceen
local.search.authorSharma, Nishaen
local.search.supervisorRuhnke, Isabelleen
local.search.supervisorSwick, Roberten
local.search.supervisorHunt, Peter Wen
local.search.supervisorHine, Bradleyen
local.uneassociationYesen
local.atsiresearchNoen
local.sensitive.culturalNoen
local.year.conferred2018en
local.subject.for2020300907 Veterinary medicine (excl. urology)en
local.subject.for2020300911 Veterinary pharmacologyen
local.subject.for2020300909 Veterinary parasitologyen
local.subject.seo2020100601 Eggsen
local.subject.seo2020109902 Animal welfareen
local.subject.seo2020100411 Poultryen
local.profile.affiliationtypeUNE Affiliationen
local.profile.affiliationtypeUNE Affiliationen
local.profile.affiliationtypeUNE Affiliationen
local.profile.affiliationtypeUNE Affiliationen
local.profile.affiliationtypeExternal Affiliationen
Appears in Collections:PoultryHub Australia
School of Environmental and Rural Science
Thesis Doctoral
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